Enantioselective Iridium-Catalyzed Carbonyl Allylation from the Alcohol or Aldehyde Oxidation Level via Transfer Hydrogenative Coupling of Allyl Acetate: Departure from Chirally Modified Allyl Metal Reagents in Carbonyl Addition
作者:In Su Kim、Ming-Yu Ngai、Michael J. Krische
DOI:10.1021/ja805722e
日期:2008.11.5
Under the conditions of transferhydrogenationemploying an iridium catalyst generated in situ from [Ir(cod)Cl]2, chiral phosphine ligand (R)-BINAP or (R)-Cl,MeO-BIPHEP, and m-nitrobenzoic acid, allyl acetate couples to allylic alcohols 1a-c, aliphatic alcohols 1d-l, and benzylic alcohols 1m-u to furnish products of carbonyl allylation 3a-u with exceptional levels of asymmetric induction. The very
Asymmetric Ruthenium-Catalyzed Carbonyl Allylations by Gaseous Allene via Hydrogen Auto-Transfer: 1° versus 2° Alcohol Dehydrogenation for Streamlined Polyketide Construction
作者:Connor Saludares、Eliezer Ortiz、Cate G. Santana、Brian J. Spinello、Michael J. Krische
DOI:10.1021/acscatal.2c05425
日期:2023.2.3
Iodide-bound ruthenium–JOSIPHOS complexes catalyze the redox-neutral C–Ccoupling of primary alcohols 2a–2r with the gaseous allene (propadiene) 1a to form enantiomerically enriched homoallylic alcohols 3a–3r with complete atom efficiency. Using formic acid as the reductant, aldehydes dehydro-2a and dehydro-2c participate in reductive C–Ccoupling with allene to deliver adducts 3a and 3c with comparable